<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="alls" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>

      <MyGouwu
        :goodList="goodList"
        @del-event="handleDel"
        @add="handleAdd"
        @reduce="handleReduce"
        @change-status-event="changeStatus"
      ></MyGouwu>

      <tfoot>
        <tr>
          <td>合计:{{ totalPrice }}</td>
          <td colspan="5"></td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import MyGouwu from "./components/MyGouwu.vue";
export default {
  components: {
    MyGouwu,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  computed: {
    alls: {
      set(value) {
        this.goodList.map((i) => (i.checked = value));
      },
      get() {
        return this.goodList.every((i) => i.checked === true);
      },
    },
    totalPrice() {
      return this.goodList.reduce((sum, item) => {
        return (sum += item.price * item.num);
      }, 0);
    },
  },
  methods: {
    changeStatus(ind) {
      const obj = this.goodList.find((item, index) => index === ind);
      obj.checked = !obj.checked;
    },
    handleAdd(index) {
      this.goodList[index].num++;
    },
    handleReduce(index) {
      this.goodList[index].num != 0 && this.goodList[index].num--;
    },
    handleDel(ind) {
      const index = this.goodList.findIndex((item, index) => index === ind);
      this.goodList.splice(index, 1);
    },
  },
};
</script>

<style></style>